[clang] [llvm] Implement operand bundles for floating-point operations (PR #109798)

[Joshua Cranmer via cfe-commits]

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@@ -357,6 +357,9 @@ class IRBuilderBase {
 
   void setConstrainedFPCallAttr(CallBase *I) {
     I->addFnAttr(Attribute::StrictFP);
+    MemoryEffects ME = MemoryEffects::inaccessibleMemOnly();
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jcranmer-intel wrote:

It should be possible to make `CallBase::getMemoryEffects` return the appropriate effects for the bundle operand, instead of needing to set it correctly.

(as a side note, since this is definitely follow-up patch territory, it probably makes sense to eventually add a FP environment mem effect separate from inaccessible mem only).

https://github.com/llvm/llvm-project/pull/109798