cgen: fix pattern generated by const_init_or_block.vv in vlib/v/gen/c/coutput_test.v, when VFLAGS=-no-parallel is used

Author: spytheman

vlib/v/gen/c/cgen.v

@@ -477,6 +477,8 @@ pub fn gen(files []&ast.File, mut table ast.Table, pref_ &pref.Preferences) GenO
 			global_g.file = file
 			global_g.gen_file()
 			global_g.cleanups[file.mod.name].drain_builder(mut global_g.cleanup, 100)
+			global_g.global_tmp_count = 0
+			global_g.tmp_count = 0
 		}
 		util.timing_measure('cgen serial processing')
 

vlib/v/gen/c/testdata/const_init_or_block_no_parallel.c.must_have

@@ -0,0 +1,11 @@
+{
+_option_bool _t2 = main__t1();
+if (_t2.state != 0) {
+IError err = _t2.err;
+_v_panic(IError_str(err));
+VUNREACHABLE();
+;
+}
+
+_const_main__barz = (((*(bool*)_t2.data)));
+}

vlib/v/gen/c/testdata/const_init_or_block_no_parallel.vv

@@ -0,0 +1,9 @@
+// vtest vflags: -no-skip-unused -no-parallel
+fn t1() ?bool {
+	return true
+}
+
+type FooBar = bool
+
+const bar = FooBar(t1() or { panic(err) })
+const barz = FooBar(t1() or { panic(err) })