use raw string literal

Author: nickdesaulniers

libc/src/setjmp/x86_64/setjmp.cpp

@@ -19,21 +19,22 @@ namespace LIBC_NAMESPACE_DECL {
 
 [[gnu::naked]]
 LLVM_LIBC_FUNCTION(int, setjmp, (__jmp_buf * buf)) {
-  asm("mov %%rbx, %c[rbx](%%rdi)\n\t"
-      "mov %%rbp, %c[rbp](%%rdi)\n\t"
-      "mov %%r12, %c[r12](%%rdi)\n\t"
-      "mov %%r13, %c[r13](%%rdi)\n\t"
-      "mov %%r14, %c[r14](%%rdi)\n\t"
-      "mov %%r15, %c[r15](%%rdi)\n\t"
-
-      "lea 8(%%rsp), %%rax\n\t"
-      "mov %%rax, %c[rsp](%%rdi)\n\t"
-
-      "mov (%%rsp), %%rax\n\t"
-      "mov %%rax, %c[rip](%%rdi)\n\t"
-
-      "xorl %%eax, %%eax\n\t"
-      "retq" ::[rbx] "i"(offsetof(__jmp_buf, rbx)),
+  asm(R"(
+      mov %%rbx, %c[rbx](%%rdi)
+      mov %%rbp, %c[rbp](%%rdi)
+      mov %%r12, %c[r12](%%rdi)
+      mov %%r13, %c[r13](%%rdi)
+      mov %%r14, %c[r14](%%rdi)
+      mov %%r15, %c[r15](%%rdi)
+
+      lea 8(%%rsp), %%rax
+      mov %%rax, %c[rsp](%%rdi)
+
+      mov (%%rsp), %%rax
+      mov %%rax, %c[rip](%%rdi)
+
+      xorl %%eax, %%eax
+      retq)" ::[rbx] "i"(offsetof(__jmp_buf, rbx)),
       [rbp] "i"(offsetof(__jmp_buf, rbp)), [r12] "i"(offsetof(__jmp_buf, r12)),
       [r13] "i"(offsetof(__jmp_buf, r13)), [r14] "i"(offsetof(__jmp_buf, r14)),
       [r15] "i"(offsetof(__jmp_buf, r15)), [rsp] "i"(offsetof(__jmp_buf, rsp)),