Revert "Rename the "llvm" API to "llvm-intrinsic"" due to tinderbox bustage

This reverts commit 6871c245a6.

src/comp/front/parser.rs

@@ -2013,7 +2013,7 @@ fn parse_item_native_mod(parser p) -> @ast.item {
         if (_str.eq(t, "cdecl")) {
         } else if (_str.eq(t, "rust")) {
             abi = ast.native_abi_rust;
-        } else if (_str.eq(t, "llvm-intrinsic")) {
+        } else if (_str.eq(t, "llvm")) {
             abi = ast.native_abi_llvm;
         } else {
             p.err("unsupported abi: " + t);

src/comp/pretty/pprust.rs

@@ -229,7 +229,6 @@ fn print_item(ps s, @ast.item item) {
             wrd1(s, "native");
             alt (nmod.abi) {
                 case (ast.native_abi_rust) {wrd1(s, "\"rust\"");}
-                case (ast.native_abi_llvm) {wrd1(s, "\"llvm-intrinsic\"");}
                 case (ast.native_abi_cdecl) {wrd1(s, "\"cdecl\"");}
             }
             wrd1(s, "mod");

src/test/bench/shootout/nbody.rs

@@ -2,7 +2,7 @@
 // based on:
 // http://shootout.alioth.debian.org/u32/benchmark.php?test=nbody&lang=java
 
-native "llvm-intrinsic" mod llvm {
+native "llvm" mod llvm {
     fn sqrt(float n) -> float = "sqrt.f64";
 }