Remove references to SVN in libsanitizer.

Simple documentation update based on usage of GIT by both
LLVM and GCC.

libsanitizer/ChangeLog:

	* HOWTO_MERGE: Do not mention not existing argument.
	* README.gcc: Update LLVM repository location.

libsanitizer/HOWTO_MERGE

@@ -3,8 +3,7 @@ track various ABI changes and GCC-specific patches carefully.  Here is a
 general list of actions required to perform the merge:
 
 * Checkout recent GCC tree.
-* Run merge.sh script from libsanitizer directory.  The script accepts one
-  argument that is control version system (svn or git).
+* Run merge.sh script from libsanitizer directory.
 * Modify Makefile.am files into asan/tsan/lsan/ubsan/sanitizer_common/interception
   directories if needed.  In particular, you may need to add new source files
   and remove old ones in source files list, add new flags to {C, CXX}FLAGS if

libsanitizer/README.gcc

@@ -3,14 +3,14 @@ projects initially developed by Google Inc.
 
 Both tools consist of a compiler module and a run-time library.
 The sources of the run-time library for these projects are hosted at
-https://llvm.org/svn/llvm-project/compiler-rt in the following directories:
-  include/sanitizer
-  lib/sanitizer_common
-  lib/interception
-  lib/asan
-  lib/tsan
-  lib/lsan
-  lib/ubsan
+https://github.com/llvm/llvm-project in the following directories:
+  compiler-rt/include/sanitizer
+  compiler-rt/lib/sanitizer_common
+  compiler-rt/lib/interception
+  compiler-rt/lib/asan
+  compiler-rt/lib/tsan
+  compiler-rt/lib/lsan
+  compiler-rt/lib/ubsan
 
 Trivial and urgent fixes (portability, build fixes, etc.) may go directly to the
 GCC tree.  All non-trivial changes, functionality improvements, etc. should go