[libc] Fix argument types for {f,}truncate specs

[alfredfo]

Summary

The current argument types are currently switched around for ftruncate
and truncate. Currently passes tests because the internal definitions
inside the __llvm_libc namespace are fine.

[alfredfo]

[libc] Fix argument types for {f,}truncate specs

s/ConstCharType/ConstCharPtr

[thesamesam]

lgtm, but not a member of llvm-libc

[sivachandra]

Thanks for catching this.

[michaelrj]

LGTM

libc/spec/posix.td

[
         FunctionSpec<
           "fsync",
           RetValSpec<IntType>,
           [ArgSpec<IntType>]
         >,
         FunctionSpec<
           "ftruncate",
           RetValSpec<IntType>,
-          [ArgSpec<ConstCharPtr>, ArgSpec<OffTType>]
+          [ArgSpec<IntType>, ArgSpec<OffTType>]
         >,
         FunctionSpec<
           "geteuid",
           RetValSpec<UidT>,
           [ArgSpec<VoidType>]
         >,
         FunctionSpec<
           "getpid",
[
         FunctionSpec<
           "__llvm_libc_syscall",
           RetValSpec<LongType>,
           [ArgSpec<LongType>,ArgSpec<LongType>,ArgSpec<LongType>,ArgSpec<LongType>,ArgSpec<LongType>,ArgSpec<LongType>,ArgSpec<LongType>]
         >,
         FunctionSpec<
           "truncate",
           RetValSpec<IntType>,
-          [ArgSpec<IntType>, ArgSpec<OffTType>]
+          [ArgSpec<ConstCharPtr>, ArgSpec<OffTType>]
         >,
         FunctionSpec<
           "unlink",
           RetValSpec<IntType>,
           [ArgSpec<ConstCharPtr>]
         >,
         FunctionSpec<
           "unlinkat",