[Parser] Enable the new text parser by default (#6371)

The new text parser is faster and more standards compliant than the old text
parser. Enable it by default in wasm-opt and update the tests to reflect the
slightly different results it produces. Besides following the spec, the new
parser differs from the old parser in that it:

 - Does not synthesize `loop` and `try` labels unnecessarily
 - Synthesizes different block names in some cases
 - Parses exports in a different order
 - Parses `nop`s instead of empty blocks for empty control flow arms
 - Does not support parsing Poppy IR
 - Produces different error messages
 - Cannot parse `pop` except as the first instruction inside a `catch`

1 files changed, 7 insertions, 3 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80d552130..a44aedcef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,9 +15,13 @@ full changeset diff at the end of each section.
 Current Trunk
 -------------
 
- - (If new wat parser is enabled) Source map comments on `else` branches must
-   now be placed above the instruction inside the `else` branch rather than on
-   the `else` branch itself.
+ - The new, standards-compliant text parser is now the default. `wasm-opt` has a
+   `--deprecated-wat-parser` flag that will switch back to using the old text
+   parser, but that option will go away soon.
+ - Source map comments on `else` branches must now be placed above the
+   instruction inside the `else` branch rather than on the `else` branch itself.
+ - Source map locations from instructions are no longer automatically propagated
+   to function epilogues.
  - Add a new `BinaryenModuleReadWithFeatures` function to the C API that allows
    to configure which features to enable in the parser.
  - The build-time option to use legacy WasmGC opcodes is removed.