Remove Emscripten support

test/CodeGen/JS/splat-precise-f32.ll

-; RUN: llc -emscripten-precise-f32=false < %s | FileCheck %s
-; RUN: llc -emscripten-precise-f32=true < %s | FileCheck --check-prefix=CHECK-PRECISE_F32 %s
-
-target datalayout = "e-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-p:32:32:32-v128:32:128-n32-S128"
-target triple = "asmjs-unknown-emscripten"
-
-; SIMD_float32x4_splat needs a float32 input even if we're not in precise-f32 mode.
-
-; CHECK: test(
-; CHECK: $d = SIMD_float32x4_splat(Math_fround($f));
-; CHECK-PRECISE_F32: test(
-; CHECK-PRECISE_F32: $f = Math_fround($f);
-; CHECK-PRECISE_F32: $d = SIMD_float32x4_splat($f);
-define <4 x float> @test(float %f) {
-  %a = insertelement <4 x float> undef, float %f, i32 0
-  %b = insertelement <4 x float> %a, float %f, i32 1
-  %c = insertelement <4 x float> %b, float %f, i32 2
-  %d = insertelement <4 x float> %c, float %f, i32 3
-  ret <4 x float> %d
-}
-
-; CHECK: test_insert(
-; CHECK: $a = SIMD_float32x4_withX($v,Math_fround($g));
-; CHECK-PRECISE_F32: test_insert(
-; CHECK-PRECISE_F32: $g = Math_fround($g);
-; CHECK-PRECISE_F32: $a = SIMD_float32x4_withX($v,$g);
-define <4 x float> @test_insert(<4 x float> %v, float %g) {
-  %a = insertelement <4 x float> %v, float %g, i32 0
-  ret <4 x float> %a
-}
-
-; CHECK: test_ctor(
-; CHECK: $d = SIMD_float32x4(Math_fround($x), Math_fround($y), Math_fround($z), Math_fround($w));
-; CHECK-PRECISE_F32: test_ctor(
-; CHECK-PRECISE_F32: $x = Math_fround($x);
-; CHECK-PRECISE_F32: $y = Math_fround($y);
-; CHECK-PRECISE_F32: $z = Math_fround($z);
-; CHECK-PRECISE_F32: $w = Math_fround($w);
-; CHECK-PRECISE_F32: $d = SIMD_float32x4($x, $y, $z, $w);
-define <4 x float> @test_ctor(<4 x float> %v, float %x, float %y, float %z, float %w) {
-  %a = insertelement <4 x float> undef, float %x, i32 0
-  %b = insertelement <4 x float> %a, float %y, i32 1
-  %c = insertelement <4 x float> %b, float %z, i32 2
-  %d = insertelement <4 x float> %c, float %w, i32 3
-  ret <4 x float> %d
-}