Reland: change most cases of variable redeclaration from TypeError to SyntaxError.

Reland: change most cases of variable redeclaration from TypeError to SyntaxError.

Reland of https://codereview.chromium.org/2048703002/

Code like `let a; eval("var a;");` should throw a SyntaxError, not a TypeError
(this caused a test262 failure.). However, the code `eval("function NaN() {}");`
should actually throw a TypeError. This patch changes most cases of
redeclaration errors from TypeError to SyntaxError. See the test
mjsunit/regress/redeclaration-error-types for a thorough analysis with spec
references.

The relevant sections of the spec are ES#sec-globaldeclarationinstantiation and
ES#sec-evaldeclarationinstantiation

BUG=v8:4955
LOG=y
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
R=adamk

Committed: https://crrev.com/d8147eb98cacfc65a802b94b3c0dc9cf88f546ab
Cr-Commit-Position: refs/heads/master@{#37156}

[jwolfe, 2016-06-21 18:31:55]

still waiting for https://codereview.chromium.org/2084963002 to land...

[adamk, 2016-06-21 18:40:33]

lgtm when Chromium's ready for the patch

[jwolfe, 2016-06-21 19:37:12]

The CQ bit was checked by jwolfe@igalia.com

[commit-bot: I haz the power, 2016-06-21 19:37:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2086063002/1

[commit-bot: I haz the power, 2016-06-21 20:18:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-21 20:20:13]

Description was changed from

==========
Reland: change most cases of variable redeclaration from TypeError to
SyntaxError.

Reland of https://codereview.chromium.org/2048703002/

Code like `let a; eval("var a;");` should throw a SyntaxError, not a TypeError
(this caused a test262 failure.). However, the code `eval("function NaN() {}");`
should actually throw a TypeError. This patch changes most cases of
redeclaration errors from TypeError to SyntaxError. See the test
mjsunit/regress/redeclaration-error-types for a thorough analysis with spec
references.

The relevant sections of the spec are ES#sec-globaldeclarationinstantiation and
ES#sec-evaldeclarationinstantiation

BUG=v8:4955
LOG=y
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
R=adamk
==========

to

==========
Reland: change most cases of variable redeclaration from TypeError to
SyntaxError.

Reland of https://codereview.chromium.org/2048703002/

Code like `let a; eval("var a;");` should throw a SyntaxError, not a TypeError
(this caused a test262 failure.). However, the code `eval("function NaN() {}");`
should actually throw a TypeError. This patch changes most cases of
redeclaration errors from TypeError to SyntaxError. See the test
mjsunit/regress/redeclaration-error-types for a thorough analysis with spec
references.

The relevant sections of the spec are ES#sec-globaldeclarationinstantiation and
ES#sec-evaldeclarationinstantiation

BUG=v8:4955
LOG=y
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
R=adamk

Committed: https://crrev.com/d8147eb98cacfc65a802b94b3c0dc9cf88f546ab
Cr-Commit-Position: refs/heads/master@{#37156}
==========

[commit-bot: I haz the power, 2016-06-21 20:20:14]

Patchset 1 (id:??) landed as
https://crrev.com/d8147eb98cacfc65a802b94b3c0dc9cf88f546ab
Cr-Commit-Position: refs/heads/master@{#37156}