tests --valgrind: provide a mode without --track-origins

With --valgrind=memcheck-fast, the tests run under memcheck but
without the autodetected --track-origins.  If you just run valgrind to
see *if* there is any memory issue with your program, the extra
information is not needed, and it comes at a roughly 30% hit in
runtime.

While it is possible to achieve the same through GIT_VALGRIND_OPTIONS,
this should be more discoverable and hopefully encourage more users to
run their tests with valgrind.

Signed-off-by: Thomas Rast <trast@inf.ethz.ch>
Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/README

@@ -106,6 +106,11 @@ appropriately before running "make".
 	'drd', but you may use any tool recognized by your valgrind
 	installation.
 
+	As a special case, <tool> can be 'memcheck-fast', which uses
+	memcheck but disables --track-origins.  Use this if you are
+	running tests in bulk, to see if there are _any_ memory
+	issues.
+
 	Note that memcheck is run with the option --leak-check=no,
 	as the git process is short-lived and some errors are not
 	interesting. In order to run a single command under the same

t/valgrind/valgrind.sh

@@ -5,6 +5,8 @@ base=$(basename "$0")
 TOOL_OPTIONS='--leak-check=no'
 
 case "$GIT_VALGRIND_MODE" in
+memcheck-fast)
+	;;
 memcheck)
 	VALGRIND_VERSION=$(valgrind --version)
 	VALGRIND_MAJOR=$(expr "$VALGRIND_VERSION" : '[^0-9]*\([0-9]*\)')