[llvm] [X86] Require legal result types for f32 estimates (PR #217810)

[Simon Pilgrim via llvm-commits]

================
@@ -0,0 +1,19 @@
+; Scalar f32 has no register class with SSE1, no SSE2, and no x87.
+; RUN: llc -mtriple=i686-unknown-linux-gnu -mattr=+sse,-sse2,-x87 \
+; RUN:   -verify-machineinstrs -o /dev/null < %s
----------------
RKSimon wrote:

drop verify-machineinstrs and run file checks (use the update scripts to check the checks for you)
```
; RUN: llc -mtriple=i686-unknown-linux-gnu -mattr=+sse,-sse2,-x87 | FileCheck %s

; Scalar f32 has no register class with SSE1, no SSE2, and no x87.
```

https://github.com/llvm/llvm-project/pull/217810