clang: add support for asmjs arch and Emscripten OS

test/Driver/asmjs-unknown-emscripten.cpp

-// RUN: %clang -target le32-unknown-nacl -### %s -emit-llvm-only -c 2>&1 | FileCheck %s -check-prefix=ECHO
-// RUN: %clang -target le32-unknown-nacl %s -emit-llvm -S -c -o - | FileCheck %s
-// RUN: %clang -target le32-unknown-nacl %s -emit-llvm -S -c -pthread -o - | FileCheck %s -check-prefix=THREADS
+// RUN: %clang -target asmjs-unknown-emscripten -### %s -emit-llvm-only -c 2>&1 | FileCheck %s -check-prefix=ECHO
+// RUN: %clang -target asmjs-unknown-emscripten %s -emit-llvm -S -c -o - | FileCheck %s
+// RUN: %clang -target asmjs-unknown-emscripten %s -emit-llvm -S -c -pthread -o - | FileCheck %s -check-prefix=THREADS
 
-// ECHO: {{.*}} "-cc1" {{.*}}le32-unknown-nacl.c
+// ECHO: {{.*}} "-cc1" {{.*}}asmjs-unknown-emscripten.c
 
 typedef __builtin_va_list va_list;
 typedef __SIZE_TYPE__ size_t;
 typedef __PTRDIFF_TYPE__ ptrdiff_t;
 
 extern "C" {
 
 // CHECK: @align_c = global i32 1
 int align_c = __alignof(char);
 
@@ skipping 22 matching lines @@
 int align_ld = __alignof(long double);
 
 // CHECK: @align_vl = global i32 4
 int align_vl = __alignof(va_list);
 
 // CHECK: __LITTLE_ENDIAN__defined
 #ifdef __LITTLE_ENDIAN__
 void __LITTLE_ENDIAN__defined() {}
 #endif
 
-// CHECK: __native_client__defined
-#ifdef __native_client__
-void __native_client__defined() {}
+// CHECK: __asmjs__defined
+#ifdef __asmjs__
+void __asmjs__defined() {}
 #endif
 
-// CHECK: __le32__defined
-#ifdef __le32__
-void __le32__defined() {}
+// CHECK: EMSCRIPTENdefined
+#ifdef EMSCRIPTEN
+void EMSCRIPTENdefined() {}
 #endif
 
-// CHECK: __pnacl__defined
-#ifdef __pnacl__
-void __pnacl__defined() {}
+// CHECK: __EMSCRIPTEN__defined
+#ifdef __EMSCRIPTEN__
+void __EMSCRIPTEN__defined() {}
 #endif
 
 // CHECK: unixdefined
 #ifdef unix
 void unixdefined() {}
 #endif
 
-// CHECK: __ELF__defined
-#ifdef __ELF__
-void __ELF__defined() {}
-#endif
-
 // CHECK: _GNU_SOURCEdefined
 #ifdef _GNU_SOURCE
 void _GNU_SOURCEdefined() {}
 #endif
 
 // THREADS: _REENTRANTdefined
 // CHECK: _REENTRANTundefined
 #ifdef _REENTRANT
 void _REENTRANTdefined() {}
 #else
@@ skipping 54 matching lines @@
 void check_pointer_size() {
   // CHECK: SwitchILi4
   Switch<sizeof(void*)>();
 
   // CHECK: SwitchILi8
   Switch<sizeof(long long)>();
 
   // CHECK: SwitchILi16
   Switch<sizeof(va_list)>();
 }