closes bpo-36002: Use AC_PATH_TOOL to find llvm-profdata and llvm-ar. (GH-14998)

(cherry picked from commit 0519d49) Co-authored-by: Doyle Rowland <doyle.rowland@reliaqual.com>

Author: miss-islington

Misc/NEWS.d/next/Build/2019-09-13-14-12-36.bpo-36002.Bcl4oe.rst

@@ -0,0 +1,2 @@
+Locate ``llvm-profdata`` and ``llvm-ar`` binaries using ``AC_PATH_TOOL``
+rather than ``AC_PATH_TARGET_TOOL``.

configure.ac

@@ -1339,7 +1339,7 @@ if test "$Py_LTO" = 'true' ; then
  case $CC in
  *clang*)
  AC_SUBST(LLVM_AR)
- AC_PATH_TARGET_TOOL(LLVM_AR, llvm-ar, '', ${llvm_path})
+ AC_PATH_TOOL(LLVM_AR, llvm-ar, '', ${llvm_path})
  AC_SUBST(LLVM_AR_FOUND)
  if test -n "${LLVM_AR}" -a -x "${LLVM_AR}"
  then
@@ -1405,7 +1405,7 @@ AC_SUBST(LLVM_PROF_MERGER)
 AC_SUBST(LLVM_PROF_FILE)
 AC_SUBST(LLVM_PROF_ERR)
 AC_SUBST(LLVM_PROFDATA)
-AC_PATH_TARGET_TOOL(LLVM_PROFDATA, llvm-profdata, '', ${llvm_path})
+AC_PATH_TOOL(LLVM_PROFDATA, llvm-profdata, '', ${llvm_path})
 AC_SUBST(LLVM_PROF_FOUND)
 if test -n "${LLVM_PROFDATA}" -a -x "${LLVM_PROFDATA}"
 then