[C++] Clean up fallthrough Warnings #41891
Description
Describe the bug, including details regarding any error messages, version, and platform.
When going through a POC with Meson I noticed the following types of warnings appearing in a standard build:
../src/arrow/util/utf8_internal.h:185:44: warning: this statement may fall through [-Wimplicit-fallthrough=]
185 | state = internal::ValidateOneUTF8Byte(data[size - 7], state);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
../src/arrow/util/utf8_internal.h:186:5: note: here
186 | case 6:
| ^~~~
../src/arrow/util/utf8_internal.h:187:44: warning: this statement may fall through [-Wimplicit-fallthrough=]
187 | state = internal::ValidateOneUTF8Byte(data[size - 6], state);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
../src/arrow/util/utf8_internal.h:188:5: note: here
188 | case 5:Should be easy enough to clean up
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