Remove Emscripten support

test/CodeGen/JS/globals.ll

-; RUN: llc < %s | FileCheck %s
-
-; Test simple global variable codegen.
-
-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 _loads() {
-; CHECK:  [[VAR_t:\$[a-z]+]] = HEAP32[2]|0;
-; CHECK:  [[VAR_s:\$[a-z]+]] = +HEAPF64[2];
-; CHECK:  [[VAR_u:\$[a-z]+]] = HEAP8[24]|0;
-; CHECK:  [[VAR_a:\$[a-z]+]] = (~~(([[VAR_s:\$[a-z]+]]))>>>0);
-; CHECK:  [[VAR_b:\$[a-z]+]] = [[VAR_u:\$[a-z]+]] << 24 >> 24;
-; CHECK:  [[VAR_c:\$[a-z]+]] = (([[VAR_t:\$[a-z]+]]) + ([[VAR_a:\$[a-z]+]]))|0;
-; CHECK:  [[VAR_d:\$[a-z]+]] = (([[VAR_c:\$[a-z]+]]) + ([[VAR_b:\$[a-z]+]]))|0;
-; CHECK:  return ([[VAR_d:\$[a-z]+]]|0);
-define i32 @loads() {
-  %t = load i32, i32* @A
-  %s = load double, double* @B
-  %u = load i8, i8* @C
-  %a = fptoui double %s to i32
-  %b = sext i8 %u to i32
-  %c = add i32 %t, %a
-  %d = add i32 %c, %b
-  ret i32 %d
-}
-
-; CHECK: function _stores([[VAR_m:\$[a-z]+]],[[VAR_n:\$[a-z]+]],[[VAR_o:\$[a-z]+]]) {
-; CHECK:  [[VAR_m:\$[a-z]+]] = [[VAR_m:\$[a-z]+]]|0;
-; CHECK:  [[VAR_n:\$[a-z]+]] = [[VAR_n:\$[a-z]+]]|0;
-; CHECK:  [[VAR_o:\$[a-z]+]] = +[[VAR_o:\$[a-z]+]];
-; CHECK:  HEAP32[2] = [[VAR_n:\$[a-z]+]];
-; CHECK:  HEAPF64[2] = [[VAR_o:\$[a-z]+]];
-; CHECK:  HEAP8[24] = [[VAR_m:\$[a-z]+]];
-define void @stores(i8 %m, i32 %n, double %o) {
-  store i32 %n, i32* @A
-  store double %o, double* @B
-  store i8 %m, i8* @C
-  ret void
-}
-
-; CHECK: allocate([133,26,0,0,0,0,0,0,205,204,204,204,204,76,55,64,2,0,0,0,0,0,0,0], "i8", ALLOC_NONE, Runtime.GLOBAL_BASE);
-@A = global i32 6789
-@B = global double 23.3
-@C = global i8 2