Changes imported from Abseil "staging" branch:

- 3eaa80f3372d679f9c7ecd7661971d7a4ee3766a Include implementation files in header. by Alex Strelnikov <strel@google.com>

GitOrigin-RevId: 3eaa80f3372d679f9c7ecd7661971d7a4ee3766a
Change-Id: Ib77722fc43798a7321443eced4eb9da2b7e40064

absl/numeric/BUILD.bazel

@@ -10,7 +10,11 @@ licenses(["notice"])  # Apache 2.0
 
 cc_library(
     name = "int128",
-    srcs = ["int128.cc"],
+    srcs = [
+        "int128.cc",
+        "int128_have_intrinsic.inc",
+        "int128_no_intrinsic.inc",
+    ],
     hdrs = ["int128.h"],
     copts = ABSL_DEFAULT_COPTS,
     deps = [

absl/numeric/int128.h

@@ -625,6 +625,12 @@ inline uint128& uint128::operator--() {
   return *this;
 }
 
+#if defined(ABSL_HAVE_INTRINSIC_INT128)
+#include "absl/numeric/int128_have_intrinsic.inc"
+#else  // ABSL_HAVE_INTRINSIC_INT128
+#include "absl/numeric/int128_no_intrinsic.inc"
+#endif  // ABSL_HAVE_INTRINSIC_INT128
+
 }  // namespace absl
 
 #endif  // ABSL_NUMERIC_INT128_H_

absl/numeric/int128_have_intrinsic.inc

@@ -1,3 +1,3 @@
 // This file will contain :int128 implementation details that depend on internal
 // representation when ABSL_HAVE_INTRINSIC_INT128 is defined. This file will be
-// included by int128.h.
+// included by int128.h.