Merge branch 'jk/cocci'

spatch transformation to replace boolean uses of !hashcmp() to
newly introduced oideq() is added, and applied, to regain
performance lost due to support of multiple hash algorithms.

* jk/cocci:
  show_dirstat: simplify same-content check
  read-cache: use oideq() in ce_compare functions
  convert hashmap comparison functions to oideq()
  convert "hashcmp() != 0" to "!hasheq()"
  convert "oidcmp() != 0" to "!oideq()"
  convert "hashcmp() == 0" to hasheq()
  convert "oidcmp() == 0" to oideq()
  introduce hasheq() and oideq()
  coccinelle: use <...> for function exclusion

submodule.c

@@ -537,7 +537,7 @@ static void show_submodule_header(struct diff_options *o, const char *path,
 			fast_backward = 1;
 	}
 
-	if (!oidcmp(one, two)) {
+	if (oideq(one, two)) {
 		strbuf_release(&sb);
 		return;
 	}