Update prebuilt Clang to r416183b from Android.

https://android.googlesource.com/platform/prebuilts/clang/host/
linux-x86/+/06a71ddac05c22edb2d10b590e1769b3f8619bef

clang 12.0.5 (based on r416183b) from build 7284624.

Change-Id: I277a316abcf47307562d8b748b84870f31a72866
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/linux-x64/clang/include/llvm/CodeGen/MachineTraceMetrics.h b/linux-x64/clang/include/llvm/CodeGen/MachineTraceMetrics.h
index 0259895..46b5736 100644
--- a/linux-x64/clang/include/llvm/CodeGen/MachineTraceMetrics.h
+++ b/linux-x64/clang/include/llvm/CodeGen/MachineTraceMetrics.h
@@ -140,13 +140,13 @@
   /// successors.
   struct LiveInReg {
     /// The virtual register required, or a register unit.
-    unsigned Reg;
+    Register Reg;
 
     /// For virtual registers: Minimum height of the defining instruction.
     /// For regunits: Height of the highest user in the trace.
     unsigned Height;
 
-    LiveInReg(unsigned Reg, unsigned Height = 0) : Reg(Reg), Height(Height) {}
+    LiveInReg(Register Reg, unsigned Height = 0) : Reg(Reg), Height(Height) {}
   };
 
   /// Per-basic block information that relates to a specific trace through the