[llvm] [VPlan] Make VPIRFlags verification type aware, fix remaining holes. (PR #213081)

[Luke Lau via llvm-commits]

================
@@ -2557,8 +2557,11 @@ VPIRFlags VPIRFlags::getDefaultFlags(unsigned Opcode, Type *ResultTy) {
   case Instruction::FPTrunc:
     return FastMathFlags();
   case Instruction::Select:
-    // Selects only have fast-math flags if they produce a floating-point value.
-    if (ResultTy && FPMathOperator::isSupportedFloatingPointType(ResultTy))
+  case Instruction::PHI:
+  case Instruction::Call:
+    // Selects, phis and calls only have fast-math flags if they produce a
+    // floating-point value.
----------------
lukel97 wrote:

`modf` returns a struct of floats, the langref seems to use the term "supported floating-point type", might be good to use it here

```suggestion
    // supported floating-point type.
```

https://github.com/llvm/llvm-project/pull/213081