Export of internal Abseil changes

--
3a9b4e8e5ecba532db5cc4ac12d12660307ce9fb by Derek Mauro <dmauro@google.com>:

Use the Bazel @platforms repository for platform constraints
Fixes #1000

PiperOrigin-RevId: 390644226

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b34e4d2f8a86b54bd483ec4c9c3dd781ad2d8b68 by Abseil Team <absl-team@google.com>:

debugging: add some handling for RISC-V

The RISC-V architecture uses a downward growing stack and can host Linux using
ELF files.  Adjust a few sites accordingly to indicate how to handle the RISC-V
architecture.

PiperOrigin-RevId: 390631894

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5fa3a0961bf3dd0799c048956a0128f7b8113f1e by Samuel Benzaquen <sbenza@google.com>:

Rename the buffer hash function to LowLevelHash.
Although it started as wyhash, it will depart from it so it does not make sense
to keep the name.

PiperOrigin-RevId: 390483506

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2e7867a2301d58ad4cd5abcaa5fd6f0db973ae7b by Abseil Team <absl-team@google.com>:

This is an internal change.

PiperOrigin-RevId: 390349746
GitOrigin-RevId: 3a9b4e8e5ecba532db5cc4ac12d12660307ce9fb
Change-Id: I322c3762552a2107e6c6b108c25c01e5efa8aecd

1 files changed, 7 insertions, 6 deletions

diff --git a/absl/hash/internal/hash.cc b/absl/hash/internal/hash.cc
index 06f53a59..4b818917 100644
--- a/absl/hash/internal/hash.cc
+++ b/absl/hash/internal/hash.cc
@@ -46,21 +46,22 @@ uint64_t MixingHashState::CombineLargeContiguousImpl64(
 
 ABSL_CONST_INIT const void* const MixingHashState::kSeed = &kSeed;
 
-// The salt array used by Wyhash. This array is NOT the mechanism used to make
-// absl::Hash non-deterministic between program invocations.  See `Seed()` for
-// that mechanism.
+// The salt array used by LowLevelHash. This array is NOT the mechanism used to
+// make absl::Hash non-deterministic between program invocations.  See `Seed()`
+// for that mechanism.
 //
 // Any random values are fine. These values are just digits from the decimal
 // part of pi.
 // https://en.wikipedia.org/wiki/Nothing-up-my-sleeve_number
-constexpr uint64_t kWyhashSalt[5] = {
+constexpr uint64_t kHashSalt[5] = {
     uint64_t{0x243F6A8885A308D3}, uint64_t{0x13198A2E03707344},
     uint64_t{0xA4093822299F31D0}, uint64_t{0x082EFA98EC4E6C89},
     uint64_t{0x452821E638D01377},
 };
 
-uint64_t MixingHashState::WyhashImpl(const unsigned char* data, size_t len) {
-  return Wyhash(data, len, Seed(), kWyhashSalt);
+uint64_t MixingHashState::LowLevelHashImpl(const unsigned char* data,
+                                           size_t len) {
+  return LowLevelHash(data, len, Seed(), kHashSalt);
 }
 
 }  // namespace hash_internal