[llvm] [SimplifyLibCalls] Constant fold scalbxx (PR #114417)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
+; RUN: opt -S -passes=instsimplify < %s | FileCheck %s
+
+declare double @scalbln(double, i64)
+declare float @scalblnf(float, i64)
+declare x86_fp80 @scalblnl(x86_fp80, i64)
+declare double @scalbn(double, i32)
+declare float @scalbnf(float, i32)
+declare x86_fp80 @scalbnl(x86_fp80, i32)
+
+;---------------------------------------------------------------------
+; scalbn(scalbn(x, a), b) -> scalbn(x, a + b)
+;---------------------------------------------------------------------
+
+define double @scalbln_scalbln(double %x, i64 %a, i64 %b) {
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arsenm wrote:

None of these tests are for constants, and none of these tests will do anything in instsimplify 

https://github.com/llvm/llvm-project/pull/114417