Integrate new arm patch and fix an LLVM bug

Thanks @luqama!

src/librustc/lib/llvm.rs

@@ -89,7 +89,7 @@ pub enum Attribute {
     // Not added to LLVM yet, so may need to stay updated if LLVM changes.
     // FIXME(#8199): if this changes, be sure to change the relevant constant
     //               down below
-    FixedStackSegment = 1 << 41,
+    // FixedStackSegment = 1 << 41,
 }
 
 // enum for the LLVM IntPredicate type
@@ -2124,10 +2124,12 @@ pub fn SetFunctionAttribute(Fn: ValueRef, attr: Attribute) {
 //               Furthermore, if we use a match of any sort then an LLVM
 //               assertion is generated!
 pub fn SetFixedStackSegmentAttribute(Fn: ValueRef) {
+    unsafe {
         let attr = 1u64 << 41;
         let lower = attr & 0xffffffff;
         let upper = (attr >> 32) & 0xffffffff;
         llvm::LLVMAddFunctionAttr(Fn, lower as c_uint, upper as c_uint);
+    }
 }
 /* Memory-managed object interface to type handles. */
 

src/llvm

@@ -1 +1 @@
-Subproject commit e3abef3eedc8d5bad3420c7e29bf2fe80585316a
+Subproject commit f67442eee27d3d075a65cf7f9a70f7ec6649ffd1