[GlobalOpt] Don't query TTI on a llvm.memcpy declaration. (#127760)

Querying TTI creates a Subtarget object, but an llvm.memcpy declaration
doesn't have target-cpu and target-feature attributes like functions
with definitions. This can cause a warning to be printed on RISC-V
because the target-abi in the Module requires floating point, but the
subtarget features don't enable floating point. So far we've only seen
this in LTO when an -mcpu is not supplied for the TargetMachine.

To fix this, get TTI for the calling function instead.

Fixes the issue reported here
https://github.com/llvm/llvm-project/issues/69780#issuecomment-2665273161

0 files changed, 0 insertions, 0 deletions