[libc] Add GPU support for the 'inttypes.h' functions

Another low hanging fruit we can put on the GPU, this ports the tests
over to the hermetic framework so we can run them on the GPU.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D154540

Author: jhuber6

libc/config/gpu/api.td

@@ -30,3 +30,7 @@ def StdIOAPI : PublicAPI<"stdio.h"> {
   ];
   let Types = ["size_t", "FILE"];
 }
+
+def IntTypesAPI : PublicAPI<"inttypes.h"> {
+  let Types = ["imaxdiv_t"];
+}

libc/config/gpu/entrypoints.txt

@@ -94,6 +94,12 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdio.stdout
     libc.src.stdio.stderr
 
+    # inttypes.h entrypoints
+    libc.src.inttypes.imaxabs
+    libc.src.inttypes.imaxdiv
+    libc.src.inttypes.strtoimax
+    libc.src.inttypes.strtoumax
+
     # gpu/rpc.h entrypoints
     libc.src.gpu.rpc_reset
 )

libc/config/gpu/headers.txt

@@ -1,6 +1,7 @@
 set(TARGET_PUBLIC_HEADERS
     libc.include.ctype
     libc.include.string
+    libc.include.inttypes
     libc.include.math
     libc.include.fenv
     libc.include.errno

libc/docs/gpu/support.rst

@@ -104,6 +104,18 @@ strtoul        |check|
 strtoull       |check|
 =============  =========  ============
 
+inttypes.h
+--------
+
+=============  =========  ============
+Function Name  Available  RPC Required
+=============  =========  ============
+imaxabs        |check|
+imaxdiv        |check|
+strtoimax      |check|
+strtoumax      |check|
+=============  =========  ============
+
 stdio.h
 --------
 

libc/test/src/inttypes/CMakeLists.txt

@@ -1,31 +1,31 @@
-add_custom_target(libc_inttypes_unittests)
+add_custom_target(libc_inttypes_tests)
 
-add_libc_unittest(
+add_libc_test(
   strtoimax_test
   SUITE
-    libc_inttypes_unittests
+    libc_inttypes_tests
   SRCS
     strtoimax_test.cpp
   DEPENDS
     libc.src.inttypes.strtoimax
     libc.test.src.stdlib.strtol_test_support
 )
 
-add_libc_unittest(
+add_libc_test(
   strtoumax_test
   SUITE
-    libc_inttypes_unittests
+    libc_inttypes_tests
   SRCS
     strtoumax_test.cpp
   DEPENDS
     libc.src.inttypes.strtoumax
     libc.test.src.stdlib.strtol_test_support
 )
 
-add_libc_unittest(
+add_libc_test(
   imaxdiv_test
   SUITE
-    libc_inttypes_unittests
+    libc_inttypes_tests
   SRCS
     imaxdiv_test.cpp
   HDRS
@@ -35,10 +35,10 @@ add_libc_unittest(
     libc.src.inttypes.imaxdiv
 )
 
-add_libc_unittest(
+add_libc_test(
   imaxabs_test
   SUITE
-    libc_inttypes_unittests
+    libc_inttypes_tests
   SRCS
     imaxabs_test.cpp
   HDRS