Revert "Remove sqrt from the volatile list (#43786)"

This reverts commit cc96240.

base/compiler/optimize.jl

@@ -621,6 +621,7 @@ function is_pure_intrinsic_infer(f::IntrinsicFunction)
              f === Intrinsics.pointerset || # this one is never effect-free
              f === Intrinsics.llvmcall ||   # this one is never effect-free
              f === Intrinsics.arraylen ||   # this one is volatile
+             f === Intrinsics.sqrt_llvm ||  # this one may differ at runtime (by a few ulps)
              f === Intrinsics.sqrt_llvm_fast ||  # this one may differ at runtime (by a few ulps)
              f === Intrinsics.have_fma ||  # this one depends on the runtime environment
              f === Intrinsics.cglobal)  # cglobal lookup answer changes at runtime

test/compiler/inline.jl

@@ -891,7 +891,3 @@ let
     ftest(a) = (fcond(a, nothing); a)
     @test fully_eliminated(ftest, Tuple{Bool})
 end
-
-# sqrt not considered volatile
-f_sqrt() = sqrt(2)
-@test fully_eliminated(f_sqrt, Tuple{})

test/math.jl

@@ -1386,11 +1386,9 @@ end
         # Runtime version
         @test sqrt(x) === y
         # Interpreter compile-time version
-        @test Base.invokelatest((@eval ()->sqrt(Base.inferencebarrier($x)))) == y
-        # Inference const-prop version
         @test Base.invokelatest((@eval ()->sqrt($x))) == y
         # LLVM constant folding version
-        @test Base.invokelatest((@eval ()->(@force_compile; sqrt(Base.inferencebarrier($x))))) == y
+        @test Base.invokelatest((@eval ()->(@force_compile; sqrt($x)))) == y
     end
 end