[wasm][test] Fix uses of EXPECT_FAILURE_LEN

Ensure that {min} is smaller than {max}, and auto-compute {max} as
{arraysize(data)}.
We had two tests which did not actually test anything.

This is the second CL in a series to improve our module decoder tests
and make them more readable.

R=titzer@chromium.org

Bug: v8:8238
Change-Id: Ie467fa54609bc5fd860608085a2d58ed8341f5e7
Reviewed-on: https://chromium-review.googlesource.com/c/1282956Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56703}

test/unittests/wasm/module-decoder-unittest.cc

@@ -111,9 +111,10 @@ namespace module_decoder_unittest {
 
 #define EXPECT_FAILURE(data) EXPECT_FAILURE_LEN(data, sizeof(data))
 
-#define EXPECT_OFF_END_FAILURE(data, min, max)          \
+#define EXPECT_OFF_END_FAILURE(data, min)                           \
   do {                                                              \
-    for (size_t length = min; length < max; length++) { \
+    STATIC_ASSERT(min < arraysize(data));                           \
+    for (size_t length = min; length < arraysize(data); length++) { \
       EXPECT_FAILURE_LEN(data, length);                             \
     }                                                               \
   } while (false)
@@ -237,7 +238,7 @@ TEST_F(WasmModuleVerifyTest, OneGlobal) {
     EXPECT_EQ(13, global->init.val.i32_const);
   }
 
-  EXPECT_OFF_END_FAILURE(data, 1, sizeof(data));
+  EXPECT_OFF_END_FAILURE(data, 1);
 }
 
 TEST_F(WasmModuleVerifyTest, AnyRefGlobal) {
@@ -458,7 +459,7 @@ TEST_F(WasmModuleVerifyTest, TwoGlobals) {
     EXPECT_EQ(WasmInitExpr::kF64Const, g1->init.kind);
   }
 
-  EXPECT_OFF_END_FAILURE(data, 1, sizeof(data));
+  EXPECT_OFF_END_FAILURE(data, 1);
 }
 
 TEST_F(WasmModuleVerifyTest, ZeroExceptions) {
@@ -643,7 +644,7 @@ TEST_F(WasmModuleVerifyTest, MultipleSignatures) {
     EXPECT_EQ(2u, result.val->signatures[2]->parameter_count());
   }
 
-  EXPECT_OFF_END_FAILURE(data, 1, sizeof(data));
+  EXPECT_OFF_END_FAILURE(data, 1);
 }
 
 TEST_F(WasmModuleVerifyTest, DataSegmentWithImmutableImportedGlobal) {
@@ -773,7 +774,7 @@ TEST_F(WasmModuleVerifyTest, OneDataSegment) {
     EXPECT_EQ(3u, segment->source.length());
   }
 
-  EXPECT_OFF_END_FAILURE(data, 14, sizeof(data));
+  EXPECT_OFF_END_FAILURE(data, 14);
 }
 
 TEST_F(WasmModuleVerifyTest, TwoDataSegments) {
@@ -831,7 +832,7 @@ TEST_F(WasmModuleVerifyTest, TwoDataSegments) {
     EXPECT_EQ(10u, s1->source.length());
   }
 
-  EXPECT_OFF_END_FAILURE(data, 14, sizeof(data));
+  EXPECT_OFF_END_FAILURE(data, 14);
 }
 
 TEST_F(WasmModuleVerifyTest, DataWithoutMemory) {
@@ -1823,7 +1824,7 @@ TEST_F(WasmModuleVerifyTest, ImportTable_off_end) {
       IMPORT_SIG_INDEX(0),  // sig index
   };
 
-  EXPECT_OFF_END_FAILURE(data, 16, sizeof(data));
+  EXPECT_OFF_END_FAILURE(data, arraysize(data) - 3);
 }
 
 TEST_F(WasmModuleVerifyTest, ExportTable_empty1) {
@@ -1971,10 +1972,7 @@ TEST_F(WasmModuleVerifyTest, ExportTableOne_off_end) {
       FUNC_INDEX(0),  // --
   };
 
-  for (size_t length = 33; length < sizeof(data); length++) {
-    ModuleResult result = DecodeModule(data, data + length);
-    EXPECT_FALSE(result.ok());
-  }
+  EXPECT_OFF_END_FAILURE(data, arraysize(data) - 3);
 }
 
 TEST_F(WasmModuleVerifyTest, FunctionSignatures_empty) {