add esprima tests and fix bugs picked up by it

test/fixtures/esprima/expression-primary/array/expected.json

@@ -0,0 +1,32 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 0,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 0
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 0,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 0
+      }
+    },
+    "sourceType": "script",
+    "body": []
+  }
+}

test/fixtures/esprima/expression-primary/array/migrated_0000.js

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+x = []

test/fixtures/esprima/expression-primary/array/migrated_0001.js

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+x = [ ]

test/fixtures/esprima/expression-primary/array/migrated_0002.js

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+x = [ 42 ]

test/fixtures/esprima/expression-primary/array/migrated_0003.js

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+x = [ 42, ]

test/fixtures/esprima/expression-primary/array/migrated_0004.js

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+x = [ ,, 42 ]

test/fixtures/esprima/expression-primary/array/migrated_0005.js

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+x = [ 1, 2, 3, ]

test/fixtures/esprima/expression-primary/array/migrated_0006.js

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+x = [ 1, 2,, 3, ]

test/fixtures/esprima/expression-primary/array/migrated_0007.js

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+日本語 = []

test/fixtures/esprima/expression-primary/array/migrated_0008.source.js

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+var source = 'T\u203F = []';

test/fixtures/esprima/expression-primary/array/migrated_0009.source.js

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+var source = 'T\u200C = []';

test/fixtures/esprima/expression-primary/array/migrated_0010.source.js

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+var source = 'T\u200D = []';

test/fixtures/esprima/expression-primary/array/migrated_0011.source.js

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+var source = '\u2163\u2161 = []';

test/fixtures/esprima/expression-primary/array/migrated_0012.source.js

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+var source = '\u2163\u2161\u200A=\u2009[]';