[clang] [llvm] [RISCV][MC] Add support for Q extension (PR #139369)

[Craig Topper via cfe-commits]

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@@ -674,6 +681,9 @@ void RISCVInstrInfo::storeRegToStackSlot(MachineBasicBlock 
&MBB,
   } else if (RISCV::FPR64RegClass.hasSubClassEq(RC)) {
     Opcode = RISCV::FSD;
     IsScalableVector = false;
+  } else if (RISCV::FPR128RegClass.hasSubClassEq(RC)) {
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topperc wrote:

This isn't an MC layer change and can't be tested.

https://github.com/llvm/llvm-project/pull/139369
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