Remove Emscripten support

test/CodeGen/JS/basics.ll

-; RUN: llc < %s | FileCheck %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"
-
-; CHECK: function _simple_integer_math(
-; CHECK:   [[VAL_A:\$[a-z]+]] = [[VAL_A]]|0;
-; CHECK:   [[VAL_B:\$[a-z]+]] = [[VAL_B]]|0;
-; CHECK:   [[VAL_C:\$[a-z]+]] = (([[VAL_A]]) + ([[VAL_B]]))|0;
-; CHECK:   [[VAL_D:\$[a-z]+]] = ([[VAL_C]]*20)|0;
-; CHECK:   [[VAL_E:\$[a-z]+]] = (([[VAL_D]]|0) / ([[VAL_A]]|0))&-1;
-; CHECK:   [[VAL_F:\$[a-z]+]] = (([[VAL_E]]) - 3)|0;
-; CHECK:   return ([[VAL_F]]|0);
-define i32 @simple_integer_math(i32 %a, i32 %b) nounwind {
-  %c = add i32 %a, %b
-  %d = mul i32 %c, 20
-  %e = sdiv i32 %d, %a
-  %f = sub i32 %e, 3
-  ret i32 %f
-}
-
-; CHECK: function _fneg(
-; CHECK:   [[VAL_D:\$[a-z]+]] = +[[VAL_D]]
-; CHECK:   [[VAL_F:\$[a-z]+]] = +0
-; CHECK:   [[VAL_F]] = -[[VAL_D]]
-; CHECK:   return (+[[VAL_F]]);
-define double @fneg(double %d) nounwind {
-  %f = fsub double -0.0, %d
-  ret double %f
-}
-
-; CHECK: function _flt_rounds(
-; CHECK: t = 1;
-declare i32 @llvm.flt.rounds()
-define i32 @flt_rounds() {
-  %t = call i32 @llvm.flt.rounds()
-  ret i32 %t
-}