Wrapping<i128> and attempt at LLVM 3.7 compat

Author: nagisa

src/libcore/num/wrapping.rs

@@ -288,6 +288,8 @@ macro_rules! wrapping_impl {
 }
 
 wrapping_impl! { usize u8 u16 u32 u64 isize i8 i16 i32 i64 }
+#[cfg(not(stage0))]
+wrapping_impl! { u128 i128 }
 
 mod shift_max {
     #![allow(non_upper_case_globals)]

src/librustc_llvm/ffi.rs

@@ -538,7 +538,6 @@ extern {
     pub fn LLVMInt16TypeInContext(C: ContextRef) -> TypeRef;
     pub fn LLVMInt32TypeInContext(C: ContextRef) -> TypeRef;
     pub fn LLVMInt64TypeInContext(C: ContextRef) -> TypeRef;
-    pub fn LLVMInt128TypeInContext(C: ContextRef) -> TypeRef;
     pub fn LLVMIntTypeInContext(C: ContextRef, NumBits: c_uint)
                                 -> TypeRef;
 

src/librustc_trans/type_.rs

@@ -96,7 +96,7 @@ impl Type {
     }
 
     pub fn i128(ccx: &CrateContext) -> Type {
-        ty!(llvm::LLVMInt128TypeInContext(ccx.llcx()))
+        ty!(llvm::LLVMIntTypeInContext(ccx.llcx(), 128))
     }
 
     // Creates an integer type with the given number of bits, e.g. i24