fix condition to align method at 32 bytes (dotnet#42909)

In dotnet#2249, we started doing alignment of methods to 32-byte boundary for Tier1. However, a method having loops bypass tiering and hence this condition was never executed. Fixed it to make sure we do the alignment for optimized methods only and don't do it for prejitted methods.

src/coreclr/src/jit/emit.cpp

@@ -4776,10 +4776,11 @@ unsigned emitter::emitEndCodeGen(Compiler* comp,
 #endif
 
 #ifdef TARGET_XARCH
-    // For x64/x86, align Tier1 methods to 32 byte boundaries if
+    // For x64/x86, align methods that are "optimizations enabled" to 32 byte boundaries if
     // they are larger than 16 bytes and contain a loop.
     //
-    if (emitComp->opts.jitFlags->IsSet(JitFlags::JIT_FLAG_TIER1) && (emitTotalHotCodeSize > 16) && emitComp->fgHasLoops)
+    if (emitComp->opts.OptimizationEnabled() && !emitComp->opts.jitFlags->IsSet(JitFlags::JIT_FLAG_PREJIT) &&
+        (emitTotalHotCodeSize > 16) && emitComp->fgHasLoops)
     {
         allocMemFlag = CORJIT_ALLOCMEM_FLG_32BYTE_ALIGN;
     }