Update LLVM fork to include a backported fix for broken debug locations

Fixes #28947

mk/main.mk

@@ -132,7 +132,11 @@ endif
 
 ifdef CFG_ENABLE_DEBUGINFO
   $(info cfg: enabling debuginfo (CFG_ENABLE_DEBUGINFO))
-  CFG_RUSTC_FLAGS += -g
+  # FIXME: Re-enable -g in stage0 after new snapshot
+  #CFG_RUSTC_FLAGS += -g
+  RUSTFLAGS_STAGE1 += -g
+  RUSTFLAGS_STAGE2 += -g
+  RUSTFLAGS_STAGE3 += -g
 endif
 
 ifdef SAVE_TEMPS

llvm @ cde1ed31

-Subproject commit 62ad301a2407a7aca50c1d5120c63597d676d29f
+Subproject commit cde1ed3196ba9b39bcf028e06e08a8722113a5cb

src/rustllvm/llvm-auto-clean-trigger

 # If this file is modified, then llvm will be forcibly cleaned and then rebuilt.
 # The actual contents of this file do not matter, but to trigger a change on the
 # build bots then the contents should be changed so git updates the mtime.
-2015-09-11
+2015-10-18