[llvm] DAG: Remove dead declaration of ExpandSinCosLibCall (PR #147673)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `premerge-monolithic-linux` running on `premerge-linux-1` while building `llvm` at step 7 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/153/builds/37476

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 7 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'SanitizerCommon-asan-x86_64-Linux :: Posix/getpass.cpp' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/build/buildbot/premerge-monolithic-linux/build/./bin/clang  --driver-mode=g++ -gline-tables-only -fsanitize=address  -m64 -funwind-tables  -I/build/buildbot/premerge-monolithic-linux/llvm-project/compiler-rt/test -ldl -O0 -g /build/buildbot/premerge-monolithic-linux/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/getpass.cpp -lutil -o /build/buildbot/premerge-monolithic-linux/build/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/asan-x86_64-Linux/Posix/Output/getpass.cpp.tmp # RUN: at line 1
+ /build/buildbot/premerge-monolithic-linux/build/./bin/clang --driver-mode=g++ -gline-tables-only -fsanitize=address -m64 -funwind-tables -I/build/buildbot/premerge-monolithic-linux/llvm-project/compiler-rt/test -ldl -O0 -g /build/buildbot/premerge-monolithic-linux/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/getpass.cpp -lutil -o /build/buildbot/premerge-monolithic-linux/build/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/asan-x86_64-Linux/Posix/Output/getpass.cpp.tmp
env ASAN_OPTIONS=detect_leaks=0  /build/buildbot/premerge-monolithic-linux/build/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/asan-x86_64-Linux/Posix/Output/getpass.cpp.tmp | FileCheck /build/buildbot/premerge-monolithic-linux/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/getpass.cpp # RUN: at line 4
+ env ASAN_OPTIONS=detect_leaks=0 /build/buildbot/premerge-monolithic-linux/build/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/asan-x86_64-Linux/Posix/Output/getpass.cpp.tmp
+ FileCheck /build/buildbot/premerge-monolithic-linux/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/getpass.cpp
/build/buildbot/premerge-monolithic-linux/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/getpass.cpp:52:11: error: CHECK: expected string not found in input
// CHECK: done
          ^
<stdin>:1:7: note: scanning from here
prompt
      ^

Input file: <stdin>
Check file: /build/buildbot/premerge-monolithic-linux/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/getpass.cpp

-dump-input=help explains the following input dump.

Input was:
<<<<<<
          1: prompt
check:52           X error: no match found
>>>>>>

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/147673