[PATCH -tip] perf tools: fix building error for arm64.

[Wang Nan]

Commit b11db6581beaccef8ae9a388ae96074aa5cc144f ("perf tools: Fix build
error on ARCH=i386/x86_64/sparc64") use sed process ARCH, which triggers
a bug in sequence of sed expression, where 's/arm.*/arm/' will replace
'arm64' to 'arm', causes arm64 building failure.

This patch replaces 'arm64' to 'aarch64' before 's/arm.*/arm/' to
protect arm64 and replaces 'aarch64' back to 'arm64' after fixing
'arm.*'.

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
---
 tools/perf/config/Makefile.arch | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/config/Makefile.arch b/tools/perf/config/Makefile.arch
index e972057..6224eb8 100644
--- a/tools/perf/config/Makefile.arch
+++ b/tools/perf/config/Makefile.arch
@@ -2,8 +2,11 @@ ifndef ARCH
 ARCH := $(shell uname -m 2>/dev/null || echo not)
 endif
 
+# Set arm64 to aarch64 before replacing arm.* to arm to protect ARCH = arm64.
+# aarch64 will be replaced by arm64 again.
 ARCH := $(shell echo $(ARCH) | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
                                   -e s/sun4u/sparc/ -e s/sparc64/sparc/ \
+				  -e s/arm64/aarch64/ \
                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
-- 
1.8.3.4

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