Update emsdk version from 154c6bf4 to abf420c8

[emscripten-bot]

This is an automatic change generated by tools/maint/rebaseline_tests.py --update-emsdk.

emsdk version updated: 154c6bf4 => abf420c8

The following revisions were included in this update:

- abf420c8 Roll llvm-project from 44e448476ee3 to 55de668108bc (31 revisions)
- d8b5017e Roll emscripten from cc7c408bf747 to fd13fb0e6b82 (3 revisions)
- 583af00f Roll binaryen from b899ca2f4c4b to bb0caa3fc547 (2 revisions)
- 94ff0e9b Roll emscripten from a16643b3598c to cc7c408bf747 (1 revision)
- 598393f8 Roll binaryen from 9b86340f97dd to b899ca2f4c4b (1 revision)
- b926d565 Roll v8 from f7e0458d30f7 to 02077f02e0f1 (34 revisions)
- daf77287 Roll llvm-project from 4ccc07bc4d10 to 44e448476ee3 (53 revisions)
- f75abb77 Roll emscripten from d0d3829af0bc to a16643b3598c (1 revision)
- 59fa333a Roll binaryen from 93c3dbf34215 to 9b86340f97dd (3 revisions)
- fa27d6ec Roll binaryen from 3fe6a5fe0cc3 to 93c3dbf34215 (1 revision)
- e692c6fb Roll llvm-project from 05bd2d911ece to 4ccc07bc4d10 (41 revisions)
- dac4bfc6 Roll binaryen from 02cb86f52e94 to 3fe6a5fe0cc3 (2 revisions)
- a63b04a7 Roll llvm-project from f6ea145aa8e8 to 05bd2d911ece (52 revisions)

Full log: https://chromium.googlesource.com/emscripten-releases/+log/154c6bf4..abf420c8

The following (4) test expectation files were updated by
running the tests with --rebaseline:

codesize/test_codesize_hello_dylink_all.json: 858893 => 858886 [-7 bytes / -0.00%]
codesize/test_minimal_runtime_code_size_hello_webgl2_wasm2js.json: 18559 => 18313 [-246 bytes / -1.33%]
codesize/test_minimal_runtime_code_size_hello_webgl_wasm2js.json: 18085 => 17840 [-245 bytes / -1.35%]
codesize/test_minimal_runtime_code_size_random_printf_wasm2js.json: 17413 => 17354 [-59 bytes / -0.34%]

Average change: -0.75% (-1.35% - -0.00%)