[clang-format] SeparateDefinitionBlocks always puts a break between a comment and the function the comment it for

[mydeveloperday]

I'm seeing some odd behaviour in SeperateDefinitionBlocks..

SeparateDefinitionBlocks: Always

void foo() {}
/* ABC */
void bar() {}

becomes

void foo() {}

/* ABC */

void bar() {}

If the ABC comment is a doxygen style comment it doesn't make sense to separate it from the function below

[mydeveloperday]

This is also true for line comments

void foo() {}

/* ABC */

void bar() {}

void foo() {}

// bar function

void bar() {}

[mydeveloperday]

Also true for namespaces

// mynamespace

namespace {}

I kind of feel this level of separation is not required

[mkurdej]

Review: https://reviews.llvm.org/D116663.