[clang] [llvm] [X86] Support EGPR for inline assembly. (PR #92338)

[Shengchen Kan via cfe-commits]

================
@@ -57999,13 +58020,25 @@ X86TargetLowering::getRegForInlineAsmConstraint(const 
TargetRegisterInfo *TRI,
     case 'q':   // GENERAL_REGS in 64-bit mode, Q_REGS in 32-bit mode.
       if (Subtarget.is64Bit()) {
         if (VT == MVT::i8 || VT == MVT::i1)
-          return std::make_pair(0U, &X86::GR8_NOREX2RegClass);
+          return std::make_pair(0U, Subtarget.hasEGPR() &&
+                                            Subtarget.useInlineAsmGPR32()
----------------
KanRobert wrote:

Define a local helper for `Subtarget.hasEGPR() && 
Subtarget.useInlineAsmGPR32()`?

https://github.com/llvm/llvm-project/pull/92338
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