Update prebuilt Clang to r365631c1 from Android.

The version we had was segfaulting.

Bug: 132420445
Change-Id: Icb45a6fe0b4e2166f7895e669df1157cec9fb4e0
diff --git a/linux-x64/clang/include/llvm/CodeGen/VirtRegMap.h b/linux-x64/clang/include/llvm/CodeGen/VirtRegMap.h
index 7bdecbe..7a64d67 100644
--- a/linux-x64/clang/include/llvm/CodeGen/VirtRegMap.h
+++ b/linux-x64/clang/include/llvm/CodeGen/VirtRegMap.h
@@ -97,8 +97,8 @@
 
     /// returns the physical register mapped to the specified
     /// virtual register
-    unsigned getPhys(unsigned virtReg) const {
-      assert(TargetRegisterInfo::isVirtualRegister(virtReg));
+    Register getPhys(Register virtReg) const {
+      assert(virtReg.isVirtual());
       return Virt2PhysMap[virtReg];
     }