Revert "[X86][MS-InlineAsm] Use exact conditions to recognize MS global variables"

This reverts commit 682d01a1c1.

Revert for buildbot fails.

clang/test/CodeGen/ms-inline-asm-functions.c

@@ -39,7 +39,7 @@ int bar() {
 int baz() {
   // CHECK-LABEL: _baz:
   __asm mov eax, k;
-  // CHECK: movl    _k, %eax
+  // CHECK: movl    k, %eax
   __asm mov eax, kptr;
   // CHECK: movl    _kptr, %eax
 }

llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp

@@ -1759,8 +1759,7 @@ bool X86AsmParser::CreateMemForMSInlineAsm(
   // registers in a mmory expression, and though unaccessible via rip/eip.
   if (IsGlobalLV && (BaseReg || IndexReg)) {
     Operands.push_back(X86Operand::CreateMem(getPointerWidth(), Disp, Start,
-                                             End, Size, Identifier, Decl,
-                                             FrontendSize));
+                                             End, Size, Identifier, Decl));
     return false;
   }
   // Otherwise, we set the base register to a non-zero value

llvm/lib/Target/X86/AsmParser/X86Operand.h

@@ -286,9 +286,10 @@ struct X86Operand final : public MCParsedAsmOperand {
   bool isOffsetOfLocal() const override { return isImm() && Imm.LocalRef; }
 
   bool isMemPlaceholder(const MCInstrDesc &Desc) const override {
-    // Only MS InlineAsm uses global variables with registers rather than
-    // rip/eip.
-    return !Mem.DefaultBaseReg && Mem.FrontendSize;
+    // Add more restrictions to avoid the use of global symbols. This helps
+    // with reducing the code size.
+    return !Desc.isRematerializable() && !Desc.isCall() && isMem() &&
+           !Mem.BaseReg && !Mem.IndexReg;
   }
 
   bool needAddressOf() const override { return AddressOf; }