[roll] Roll llvm-project/libc [libc][math] Implement double precision sincos correctly rounded to all rounding modes. (#96719)

Sharing the same algorithm as double precision sin:
llvm/llvm-project#95736 and cos:
llvm/llvm-project#96591

GitOrigin-RevId: 8eda5e8754fda4422617d069315bd0ce34d99b0d
Original-Revision: 4e4be54614351dfbf2503dd5369b0837e3f56993
Change-Id: Ie2bd882ad9952a0969feb84edcf1daffab6901b4

Author: lntue

third_party/flower

@@ -360,7 +360,7 @@
              gitsubmoduleof="fuchsia"
              path="third_party/llvm-libc/src"
              remote="https://llvm.googlesource.com/llvm-project/libc"
-             revision="c2daa51b2377c22ff388c970dd5c43887f40d6ca"/>
+             revision="4e4be54614351dfbf2503dd5369b0837e3f56993"/>
     <project name="third_party/lz4"
              gitsubmoduleof="fuchsia"
              path="third_party/lz4"