Revert of [WIP][turbofan] Instruction scheduler for Turbofan. (patchset

crosswalk-project#7 id:120001 of https://codereview.chromium.org/1375253002/ )

Reason for revert:
Does not compile

https://build.chromium.org/p/client.v8/builders/V8%20Arm%20-%20debug%20builder/builds/6870/steps/compile/logs/stdio

Original issue's description:
> [turbofan] Instruction scheduler for Turbofan.
>
> Implement machine instruction scheduling after instruction selection.
>
> Currently only works for arm64.
>
> R=danno@chromium.org, bmeurer@chromium.org, titzer@chromium.org
>
> Committed: https://crrev.com/e11bba3acd5188f0e12686b6fcf3e0ab22989216
> Cr-Commit-Position: refs/heads/master@{#32858}

TBR=jarin@chromium.org,bmeurer@chromium.org,baptiste.afsa@arm.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1526913002

Cr-Commit-Position: refs/heads/master@{#32860}

BUILD.gn

@@ -750,8 +750,6 @@ source_set("v8_base") {
     "src/compiler/greedy-allocator.cc",
     "src/compiler/greedy-allocator.h",
     "src/compiler/instruction-codes.h",
-    "src/compiler/instruction-scheduler.cc",
-    "src/compiler/instruction-scheduler.h",
     "src/compiler/instruction-selector-impl.h",
     "src/compiler/instruction-selector.cc",
     "src/compiler/instruction-selector.h",
@@ -1298,7 +1296,6 @@ source_set("v8_base") {
       "src/crankshaft/ia32/lithium-ia32.h",
       "src/compiler/ia32/code-generator-ia32.cc",
       "src/compiler/ia32/instruction-codes-ia32.h",
-      "src/compiler/ia32/instruction-scheduler-ia32.cc",
       "src/compiler/ia32/instruction-selector-ia32.cc",
       "src/debug/ia32/debug-ia32.cc",
       "src/full-codegen/ia32/full-codegen-ia32.cc",
@@ -1330,7 +1327,6 @@ source_set("v8_base") {
     sources += [
       "src/compiler/x64/code-generator-x64.cc",
       "src/compiler/x64/instruction-codes-x64.h",
-      "src/compiler/x64/instruction-scheduler-x64.cc",
       "src/compiler/x64/instruction-selector-x64.cc",
       "src/crankshaft/x64/lithium-codegen-x64.cc",
       "src/crankshaft/x64/lithium-codegen-x64.h",
@@ -1389,7 +1385,6 @@ source_set("v8_base") {
       "src/arm/simulator-arm.h",
       "src/compiler/arm/code-generator-arm.cc",
       "src/compiler/arm/instruction-codes-arm.h",
-      "src/compiler/arm/instruction-scheduler-arm.cc",
       "src/compiler/arm/instruction-selector-arm.cc",
       "src/crankshaft/arm/lithium-arm.cc",
       "src/crankshaft/arm/lithium-arm.h",
@@ -1442,7 +1437,6 @@ source_set("v8_base") {
       "src/arm64/utils-arm64.h",
       "src/compiler/arm64/code-generator-arm64.cc",
       "src/compiler/arm64/instruction-codes-arm64.h",
-      "src/compiler/arm64/instruction-scheduler-arm64.cc",
       "src/compiler/arm64/instruction-selector-arm64.cc",
       "src/crankshaft/arm64/delayed-masm-arm64.cc",
       "src/crankshaft/arm64/delayed-masm-arm64.h",
@@ -1467,7 +1461,6 @@ source_set("v8_base") {
     sources += [
       "src/compiler/mips/code-generator-mips.cc",
       "src/compiler/mips/instruction-codes-mips.h",
-      "src/compiler/mips/instruction-scheduler-mips.cc",
       "src/compiler/mips/instruction-selector-mips.cc",
       "src/crankshaft/mips/lithium-codegen-mips.cc",
       "src/crankshaft/mips/lithium-codegen-mips.h",
@@ -1509,7 +1502,6 @@ source_set("v8_base") {
     sources += [
       "compiler/mips64/code-generator-mips64.cc",
       "compiler/mips64/instruction-codes-mips64.h",
-      "compiler/mips64/instruction-scheduler-mips64.cc",
       "compiler/mips64/instruction-selector-mips64.cc",
       "src/crankshaft/mips64/lithium-codegen-mips64.cc",
       "src/crankshaft/mips64/lithium-codegen-mips64.h",

src/compiler/arm/code-generator-arm.cc

@@ -490,7 +490,6 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       DCHECK_EQ(LeaveCC, i.OutputSBit());
       break;
     case kArchNop:
-    case kArchThrowTerminator:
       // don't emit code for nops.
       DCHECK_EQ(LeaveCC, i.OutputSBit());
       break;

src/compiler/arm64/code-generator-arm64.cc

@@ -589,7 +589,6 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       AssembleArchLookupSwitch(instr);
       break;
     case kArchNop:
-    case kArchThrowTerminator:
       // don't emit code for nops.
       break;
     case kArchDeoptimize: {