Merge bitcoin/bitcoin#34460: iwyu: Update mappings

9c839aa9e3 iwyu: Document mappings for libc symbols (Hennadii Stepanov)
91824646c5 iwyu: Add temporary mapping to work around upstream bug (Hennadii Stepanov)
37de7d1910 iwyu: Drop backported mapping (Hennadii Stepanov)

Pull request description:

  This PR:
  1. Removes mappings that have been [backported](https://github.com/include-what-you-use/include-what-you-use/pull/1706) upstream.
  2. Adds a new temporary mapping to work around upstream [issue](https://github.com/include-what-you-use/include-what-you-use/issues/1616).
  3. Document the existing mappings for libc symbols.

ACKs for top commit:
  maflcko:
    lgtm ACK 9c839aa9e3
  sedited:
    ACK 9c839aa9e3

Tree-SHA512: 691fd9fc6798951ca1a621ee607a617ebef2ed2f43196465c78c6cd7a5ea7f0f0e876e68cd54653edf9b6762ae5fdb704469a1524a5f6f1ab8b0eedbff65cc28

contrib/devtools/iwyu/bitcoin.core.imp

@@ -6,15 +6,13 @@
   { "include": [ "<tmmintrin.h>", "private", "<immintrin.h>", "public" ] },
 
   # libc symbols.
+  # See: https://github.com/include-what-you-use/include-what-you-use/issues/1809.
   { "symbol": ["AT_HWCAP", "private", "<sys/auxv.h>", "public"] },
   { "symbol": ["AT_HWCAP2", "private", "<sys/auxv.h>", "public"] },
 
-  # Fixed in https://github.com/include-what-you-use/include-what-you-use/pull/1706.
-  { "symbol": ["SEEK_CUR", "private", "<cstdio>", "public"] },
-  { "symbol": ["SEEK_END", "private", "<cstdio>", "public"] },
-  { "symbol": ["SEEK_SET", "private", "<cstdio>", "public"] },
-
-  # IWYU bug.
+  # Workarounds for IWYU issues.
+  # See: https://github.com/include-what-you-use/include-what-you-use/issues/1616.
+  { "symbol": ["std::pair", "private", "<utility>", "public"] },
   # See: https://github.com/include-what-you-use/include-what-you-use/issues/1863.
   { "symbol": ["std::vector", "private", "<vector>", "public"] },
 ]

src/crypto/chacha20.h

@@ -8,7 +8,6 @@
 #include <array>
 #include <cstddef>
 #include <cstdint>
-#include <iterator>
 #include <span>
 #include <utility>
 

src/index/txindex.cpp

@@ -24,7 +24,6 @@
 #include <cstdint>
 #include <cstdio>
 #include <exception>
-#include <iterator>
 #include <span>
 #include <string>
 #include <utility>