[PATCH v4 0/1] fix perf build issue when ARCH=x86_64

From: Jiada Wang Changes from v4: update changlog to describe the reason of build failure replace ARCH with SRCARCH in pmu-events/Build and util/header.c Changes from v3: replace ARCH with SRCARCH in perf Changes from v2: added function purify-arch, transforms both

[PATCH v4 0/1] fix perf build issue when ARCH=x86_64

From: Jiada Wang Changes from v4: update changlog to describe the reason of build failure replace ARCH with SRCARCH in pmu-events/Build and util/header.c Changes from v3: replace ARCH with SRCARCH in perf Changes from v2: added function purify-arch, transforms both HOSTARCH and ARCH to