llvm-reduce: Preserve original callsite calling conv when removing arguments

[arsenm]

In undefined mismatch cases, this was fixing the callsite to use the calling
convention of the new function. Preserve the original wrong callsite's calling
convention.

[arsenm]

• llvm-reduce: Try to preserve instruction metadata as argument attributes #133557
• llvm-reduce: Fix losing call metadata in operands-to-args #133422
• llvm-reduce: Fix losing fast math flags in operands-to-args #133421
• llvm-reduce: Fix losing callsite attributes in operand-to-args #133420
• llvm-reduce: Filter function based on uses before removing arguments #133412
• llvm-reduce: Preserve original callsite calling conv when removing arguments #133411 👈 (View in Graphite)
• llvm-reduce: Fix losing operand bundles when removing arguments #133410
• llvm-reduce: Fix losing metadata when removing arguments #133409
• llvm-reduce: Fix losing fast math flags when removing arguments #133408
• llvm-reduce: Fix losing callsite attributes when removing arguments #133407
• llvm-reduce: Avoid invalid reductions on x86_intrcc #133396
• main

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[arsenm]

Merge activity

• Mar 28, 12:49 PM EDT: Graphite rebased this pull request as part of a merge.
• Mar 28, 12:51 PM EDT: A user merged this pull request with Graphite.